Transcript
INSTALLATIONSANVISNING INSTALLATION MANUAL INSTALLATIONS ANLEITUNG 6152-2002
Galvanic Isolation
Transient Protection
Balanced Transmission
CE Approved
Omvandlare RS-232 – RS-422/485 Converter RS-232 – RS-422/485 RS-232 – RS-422/485 Wandler
www.westermo.se
© Westermo Teleindustri AB • 1999 • Rev. B
C A 2 4 MD DC 2 4 D M
Specifications Transmission Interface 1 Interface 2 Data rate Indicators Insulation Insulation voltage Overvoltage protection
Power supply Fuse Power consumption Temperature range Humidity Dimensions Weight Mounting
Asynchronous, full/half duplex or simplex EIA RS-232-C/CCITT V.24, 9-position D-sub female / Screw-terminal EIA RS-422/RS-485/CCITT V.11 Up to 115.2 kbit/s Power, TD, RD, RTS, CTS, DCD Galvanic insulation with opto-coupler (data transmission) and transformer (supply) 1500V Mains: Breakdown voltage 430V at 230V AC and 230V at 115V AC* Interface 2: Breakdown voltage transmitter and receiver 7V Surge capacity 0.6 kW for 1ms 115V*/230VAC +15/–10% 48–62Hz 100 mA fast 5x20 mm Max 4VA at 115V*/230V AC 5-50°C, ambient temperature 0–95% RH, non-condensing 55x100x128 mm (BxHxD) AC 0.5 kg, DC 0.3 kg At DIN-rail 35 mm
* MD-42 115V AC only
Warning! Do not open connected unit
PW TD RD RTS CTS DCD DT DS SG 103 104 105 106 109 108 107 102
V24/RS-232-C CONNECTION MD-42 DC
1 2 3 4
8
S2:1-6
5 6 7 8 9
S3:1-6
V24/RS-232-C RS-422/RS-485/V11 CONVERTER
LINE CONNECTION R+ R- T+ 1 2 3
T4
5
POWER 12-36V DC - +
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CTS-delay
Transmitter Transmitter Activated by
CTS contolled by
DCD contolled by
RTS
RTS
RTS
ON
0ms
S2 1 2 3 4 5 6
ON
S2
ON
S2
1 2 3 4 5 6
20ms 1 2 3 4 5 6
ON
S2
RTS
RTS
Always high
DTR
DTR
DTR
1 2 3 4 5 6
Selection of 2- or 4-wire
ON
S2
ON
1 2 3 4 5 6
S2
4-wire
S3 1 2 3 4 5 6
ON
DTR
DTR
Always high ON
1 2 3 4 5 6
S3
2-wire 1 2 3 4 5 6
S2
ON
Always active Always high
Always low
Always active Always high
Always high
1 2 3 4 5 6
S2
Factory settings
ON
ON
1 2 3 4 5 6
S2 1 2 3 4 5 6
Termination with fail-safe 1)
ON
S3 1 2 3 4 5 6
ON
Termination (4-wire)
S3 1 2 3 4 5 6
ON
S3
Termination (2-wire) 1 2 3 4 5 6
ON
S3
No termination 1 2 3 4 5 6
1) The fail-safe function forces the signal state of the receiver to OFF when the connected transmitter is in tri-state (transmitter inactive). The receiver located furthest away shall be terminated.
Switch settings The MD-42 can through different switch settings be adapted to a vareity of running conditions. To set switches, open the plastic case by removing the top cover. S2 Selection of signal activating the transmitter Selection of signal controlling DCD Selection of CTS delay S3 Selection of termination with fail-safe 1) Selection of 2- or 4-wire communication
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Connections MD-42 Power connection (AC) (3-position screw-terminal)
Line connection (5-Position screw-terminal) Direction
No.
Description
1 2 3 4 5
A’ (R+) B’ (R–) A (T+) B (T–) Shield
Receiver Receiver Transmitter Transmitter
Power Screw Supply no. N 115V*/230V L AC power PE/Protective Earth * MD-42 115V only
The definations R+/R–,T+/T– can be various between different manufactures.
Terminal connection (DCE) (RS-232-C/V.24, 9-position D-sub, female/screw-terminal) Drection
Pin no.
I O I O O – O I
3 2 7 8 6 5 1 4
Screw- CCITT V.24 terminal Circuit no. Description 8 7 6 5 2 9&1 4 3
103 104 105 106 107 102 109 108/2
TD/Transmitted Data RD/Received Data RTS/Request To Send CTS/Clear To Send DSR/Data Set Ready SG/Signal Ground DCD/Data Carrier Detect DTR/Data Terminal Ready
I = Input O = Output on MD-42
Line connection 4-wire MD-42 1 Receiver A’ 2 B’ 3 Transmitter A 4 B Shield 1) 5
RS-422 equipment
Twisted pairs
2-wire
RS-485 equipment
MD-42
A Transmitter B A’ Receiver B’
Twisted pairs Transmitter/ 3 A/A’ Receiver 4 B/B’ Shield 1) 5
A/A’
Transmitter/ Receiver
B/B’
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
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Transmission range (interface 2) Use twisted pair cable. Max transmission range 1200 m. (cable specifications 0.3 mm2 and capacitance 42pF/m ). The transmission range will increase if a cable with lower capacitance and larger diameter is used. Use shielded cable in heavy industrial environments.
MD-42 DC Specifications Power supply Power consumption Insulation Fuse F1
12–36V DC Max 2.3W 500V 1.6A fast 5x20 mm
All other specifications according to MD-42 AC
Switch settings According to MD-42 AC
Connections According to MD-42 AC, except power supply Connection no.
Power Supply
1
– Voltage
2
+ Voltage
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Hints RS-422/485 was designed for multidrop applications. When a system is installed it should form a bus structure (see diagrams). Star shaped networks should never be created, there are other Westermo products designed to work in star net applications. To correctly install, an RS-422/485 network should be terminated at the correct points. The recommendation is to terminate the receiver on the master unit and the final bus slave unit. See diagrams for details of how this is done with RS-485 (2-wire) and RS-422 (4-wire). On 4-wire systems when the MD-42 is on a slave system, it’s transmitter is linked to the same bus as all the other slave transmitters. A status signal RTS or DTR is used to control the MD-42’s transmitter, to ensure only one slave is active on the bus at one time. The status signal is also used to control direction for RS-485 (2 wire) transmission. If any problems do occur on set up of the MD-42, the LED’s will be helpful. • PWR: The unit has power. • RD: Data received on the RS-422/485 interface. • DCD: Simulated carrier due to the setting of S2. • CTS: Follows RTS. • RTS: Indicates that the RS-422/485 transmitter is activated. • TD: Data received on the RS-232/V.24 interface.
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Max 1200 metre and 32 connections 3 (A/A’) 4 (B/B’
Termination
Max 0.3 metre B/B’A/A’
B/B’A/A’
B/B’A/A’
1 (A’) 2 (B’) 3 (A) 4 (B) Max 0.3 metre Termination
B’ A’ B
A
B’ A’ B
A B’ A’ B
A
N.B. R+/R–, T+/T– definitations are not standard, it can help to shift A and B if the unit does not work.
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Block diagram
V.11/RS-422 RS-485
V.24/RS-232 2)
TD
3
3
A
TD 4
S2 RTS DTR DCD
1 2 +5V 3 1 4 5 DCD 7 4
1K 100R 1K 20mS
8 CTS
6 S3
+5VB
+5V
5
4
S3
0VB
S2 CTS
B
6
3
RTS 2
RD
1
RD
DSR
0VB
0V
5
D-sub housing
5
A' B' Shield
+5V
6
PWR SG
1 2
S3
2
2) R
+12V +5V 0V -12V
R44 PE
PE F1
+5VB
Volt
Power supply
sel Insulated power supply 115/ 230V
0VB PE
R45
1) 0VB
Westermo Teleindustri AB • S-640 40 Stora Sundby, Sweden Phone +46 16 612 00 Fax +46 16 611 80 E-mail:
[email protected] • Westermo Web site: www.westermo.se Subsidiaries Westermo Data Communications Ltd Solent Business Centre • Millbrook Road West Millbrook, Southampton • SO15 0HW Phone: +44(0)2380 704 611 • Fax.:+44(0)2380 702 682 E-Mail:
[email protected]
Westermo Data Communications GmbH Bruchsaler Straße 18, 68753 Waghäusel Tel.: +49(0)7254-95400-0 • Fax.:+49(0)7254-95400-9 E-Mail:
[email protected]
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Westermo Teleindustri AB have distributors in several countries, contact us for further information.
12.99 TunaTryck AB, Eskilstuna, Sweden
1) 0 ½ resistor R45 is normally not mounted. 2) Metal housing on D-sub is connected to PE if R is mounted. R = R3 on DC-model (normally mounted), R = R1 on AC-mod (normally not mounted).
